Page 7 - GETELEC - Products and solutions Catalog

Radio High Micro- infra- ultra-
Low frequencies frequencies waves red visible light violet X and Gamma
Frequencies Rays

The principles of shielding:

- to attenuate the electromagnetic field emitted by a device in order to make it compliant
with radiated emissions
- to attenuate the electromagnetic fields received by the internal electronics of the equipment
to make it compliant with electromagnetic immunity standards.
Shielding is:

- Making a screen (shielding) around a cable
- Sealing the openings in a housing by building in a conductive gasket
- Improving the electrical continuity (high frequency) between the cable shielding and
the device's chassis.
- Improving the electrical continuity (high frequency) and equipotential bonding of a system's
earths without necessarily aiming for sealing.
- Using the housing as a Faraday cage
- Improving the shielding's low frequency (magnetic) and high frequency absorption.

The functions of a conductive silicone gasket

1- Electrical continuity
The function of a conductive gasket is to preserve electrical conductivity in the shielding. The load
used for our silicone gaskets depends on the electromagnetic performance desired
and the equipment's working environment.
The conductive particles (10 to 40 micron) forming the load (between 60% and 80% of the
load) of our conductive formulations can be varied to meet
your equipment's galvanic couple.

2- Sealing
Using a conductive silicone gasket fulfils two objectives in just one seal,
electrical continuity and physical sealing. And indeed, silicone's properties
ensure perfect sealing for the great majority of fluids. In this way, your equipment's
operability is guaranteed even in extreme salt fog type conditions.

7